Stéfan van der Walt wrote: > 2009/3/12 David Cournapeau <courn...@gmail.com>: > >> Anyway, here is a first shot at it: >> >> http://codereview.appspot.com/26052 >> > > Design question: should [('x', float), ('y', float)] and [('t', > float), ('s', float)] hash to the same value or not? >
According to: http://docs.python.org/reference/datamodel.html#object.__hash__ The only constraint is that a == b -> hash(a) == hash(b) (which is broken currently in numpy, even for builtin dtypes). The main problem is that I am not very clear yet on what a == b is for dtypes (the code for PyArray_EquivTypes goes through PyObject_Compare for compound types). In your example, both dtypes are not equal (and they do not hash the same). cheers, David _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
